REDUCING TRANSMITTER ENCODING JITTER IN A C-PHY INTERFACE USING MULTIPLE CLOCK PHASES TO LAUNCH SYMBOLS

摘要

Apparatus, systems and methods for error detection in transmissions on a multi-wire interface are disclosed. One method includes providing a plurality of launch clock signals, including launch clock signals having a different phase shifts, determining a type of transition in signaling state that will occur on each wire of the 3-wire interface at a boundary between two consecutively transmitted symbols, and selecting one of the plurality of launch clock signals to initiate the transition of signaling state on each wire of the 3-phase interface. Selecting one of the plurality of launch clock signals may include selecting a first launch clock signal when the transition in signaling state terminates at an undriven state, and selecting a second launch clock signal when the transition in signaling state begins at an undriven state. An edge in the first launch clock signal may occur before a corresponding edge in the second launch clock signal.

主权项

1. A method of transmitting data on a multi-wire interface, comprising:
providing a plurality of launch clock signals, certain of the launch clock signals having a different phase-shift with respect to a symbol clock used to control symbol transmission on a 3-wire interface, wherein during each symbol transmission, a 3-phase signal is transmitted on each wire of the 3-wire interface, the 3-phase signal transmitted on each wire being out-of-phase with signals transmitted on each other wire of the 3-wire interface; determining a type of transition in signaling state that will occur on each wire of the 3-wire interface at a boundary between two consecutively transmitted symbols; and selecting one of the plurality of launch clock signals to initiate the transition of signaling state on each wire of the 3-wire interface, wherein selecting one of the plurality of launch clock signals includes:
selecting a first launch clock signal when the transition in signaling state terminates at an undriven state, andselecting a second launch clock signal when the transition in signaling state begins at an undriven state, and wherein an edge in the first launch clock signal occurs before a corresponding edge in the second launch clock signal.